Dilip Chate

Dilip Chate
Indian Institute of Tropical Meteorology | IITM

Ph. D.

About

106
Publications
28,148
Reads
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2,951
Citations
Citations since 2016
46 Research Items
2093 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Education
July 2003 - September 2006
Independent Researcher
Independent Researcher
Field of study
  • Physics

Publications

Publications (106)
Article
Surface ozone (O3) is an important pollutant. In this study we investigated the effects of precursor gases on the difference in ozone concentration utilizing various statistical methods like Multiple Linear Regression (MLR), Principal Component Regression (PCR), Artificial Neural Network (ANN), and Principal Component and Artificial Neural Network...
Article
Full-text available
The present study analyses the continuous in-situ observations of surface ozone (O3), carbon monoxide (CO), and nitrogen oxides (NOX) conducted in an urban location, Bengaluru, India, during the year 2019 (January to December). The seasonal concentration of O3 fluctuated with the highest concentrations in the summer (39.6 ppbv) and winter (40.4 ppb...
Article
Rapid infrastructure development, increased population, shift in land use practices and higher vehicular emissions have all influenced Ozone (O3 ) production through its precursor gases in southern megacity, Bengaluru, India. We have investigated the photochemistry, using hourly measurements of O3 and associated precursor gases conducted in Bengalu...
Article
Full-text available
This paper presents the analysis of the frequency of lightning strikes associated with thunderstorm and precipitation distributions over smooth oceanic surface relative to that over solid earth surface in the tropical region. Long-term (1998–2014) data retrieved from the Lightning Imaging Sensors (LIS) of the Tropical Rainfall Measuring Mission (TR...
Article
Full-text available
Precipitation samples were collected over Arabian Sea during Arabian Sea Monsoon Experiment (ARMEX) campaign for the period June- August 2002 onboard Ocean Research vessel Sagar Kanya. All the rain water samples were analysed for pH and major water soluble ionic components. The pH of rain water was alkaline and the order of chemical composition is...
Article
Full-text available
To improve ambient air quality, India has laid out strict action plans to reduce the increment in emissions over regional to urban scale by the year 2030. This study evaluates policy-induced improvement in air quality and associated health benefits achievable due to reduction in PM2.5 exposure under the adoption of promulgated (S2) and ambitious pr...
Article
Full-text available
Bengaluru, also considered India’s Silicon Valley, has seen steady growth in population over the years. Bengaluru’s rapid development has resulted in dwindling reservoirs, increased traffic congestion, high levels of air pollution, and, to some measure, a rise in summer temperatures. As a result of these changes in urban form over the last decade,...
Article
This paper presents a relationship of lightning activity with maximum air temperature, Bowen ratio, rainfall, cloud ice contents and Aerosol Optical Depth (AOD) over India during transition period from dry to wet seasons. Lightning flash count data and weather parameters are retrieved from the Tropical Rainfall Measuring Mission (Lightning Imaging...
Article
Full-text available
This paper presents the lightning activity, aerosol optical depth (AOD) and climatic parameters (Bowen ratio, relative humidity, rainfall, maximum surface temperature and maximum updraft speed) over wet (Northeast India—NEI) and dry (Northwest India—NWI) land surfaces in a comparative analysis. The analyses are performed on flash counts and weather...
Article
Air quality has become one of the most important environmental concerns for Delhi, India. In this perspective , we have developed a high-resolution air quality prediction system for Delhi based on chemical data assimilation in the chemical transport model-Weather Research and Forecasting with Chemistry (WRF-Chem). The data assimilation system was a...
Article
Surface snow and lake water samples were collected at different locations around Indian station at Antarctica, Maitri, Samples were analyzed for major chemical ions. It is found that average pH value of snow is 6.1. Average pH value of lake water with low chemical content is 6.2 and of lake water with high chemical content is 6.5. The Na + and Cl −...
Technical Report
Full-text available
Editorial: Human perception on climate change as a natural disaster demands management solutions of remediation, mitigation, and resilience in sustainable, eco-friendly, and economic manner. A better solution however always demands more detailed examination. Hence, any detailed study or team effort at a given time remains inadequate or incomplete f...
Article
Full-text available
The land-ocean convective contrasts observed by the satellite-driven data from the Tropical Rainfall Measuring Mission for the year 1998 to 2014 (17 years) are analysed to examine the role of static land surface relative to the dynamic ocean surface for the lightning flash counts (FC). We present the relationship between the lightning flash counts...
Article
Full-text available
In this study, we used remotely sensed backscattered profiles from the ceilometer to understand the vertical and horizontal mixing of aerosols in the polluted planetary boundary layer (PBL). Backscattered profiles from the ceilometer were able to reveal information on the boundary layer structure including mixed layer, nocturnal residual layer and...
Article
Physical characterisation of \(\hbox {PM}_{2.5}\), \(\hbox {PM}_{10}\) and surface ozone measured during the period from 17 July to 21 August 2012 at four strategic locations in and around the Lumbini Protected Zone, Nepal, is done to assess air quality of the region and understand qualitatively source mechanisms of these pollutants. The measuremen...
Article
Full-text available
The present study evaluates the performance of four planetary boundary layer (PBL) parameterization schemes combined with five cloud microphysics schemes in Weather Research Forecasting (WRF) model, specifically for an advection fog event occurred during 4–6 December 2014 at Barkachha, rural site in the Indo-Gangetic plain (IGP). For this purpose,...
Article
Data on mass concentration of PM2.5 and its carbonaceous and water soluble inorganic chemical ions were compiled through sampling of PM2.5 at Indira Gandhi International Airport, Delhi during Dec. 16, 2015-Feb. 15, 2016 under Winter Fog Experiment (WIFEX) program of the Ministry of Earth Sciences (MoES) and analysing the samples. The data so genera...
Article
Full-text available
In this study, the sensitivity of Weather Research and Forecasting (WRF) model to predict life-cycle of a dense fog occurred on the 23-24 January 2016 is evaluated using different model configurations. For the first time the Intensive Observational Periods (IOPs) were made during the unique WInter Fog EXperiment (WIFEX) took place over Delhi, India...
Article
Full-text available
Physical characterisation of PM 2.5 , PM 10 and surface ozone measured during the period from 17 July to 21 August 2012 at four strategic locations in and around the Lumbini Protected Zone, Nepal, is done to assess air quality of the region and understand qualitatively source mechanisms of these pollutants. The measurement locations are Panditarama...
Article
Full-text available
Concentrations of fine particulate matter (PM 2.5 ) that exceed air quality standards affect human health and have an impact on the earth’s radiation budget. The lack of round the clock ground-based observations from a dense network of air quality stations inhibits the understanding of PM 2.5 ’s spatio-temporal variability and the assessment of its...
Presentation
I have presented (oral) in AGU 2018 Fall Meeting about the complete overview of our winter fog key study results from WiFEX 2015-18, which is important to understand the physical mechanism of fog formation and dispersion also to develop suitable fog forecasting system.
Poster
Full-text available
The fog Experiment was carried out in Delhi to characterize the chemical and microphysical properties of dense fogs occur in the winter season over the northern part of India. This study provides results on aerosol and fog water chemistry, and micro-physical properties during dense fog (around 25 events) occurred during 2015 – 2018 winter seasons....
Article
Full-text available
Field crops can be injured when exposed to high concentrations of various air pollutants due to intensive developmental activities. Injury ranges from visible markings on the foliage, to reduced growth and yield, to premature death of the plant. The development and severity of the injury depends not only on the concentration of the particular pollu...
Article
During the foggy period (December 2015 to February, 2016), the fine particulate matter (PM: <2.5 micro meter) day and night time samples were collected at the Indira Gandhi International Airport New Delhi. The samples were weighted for mass concentrations and analysed in the laboratory for chemical species of nine water soluble inorganic ions (Na+,...
Article
During the foggy period (December 2015 to February, 2016), the fine particulate matter (PM: <2.5 micro meter) day and night time samples were collected at the Indira Gandhi International Airport New Delhi. The samples were weighted for mass concentrations and analysed in the laboratory for chemical species of nine water soluble inorganic ions (Na+,...
Article
Full-text available
The relationship between aerosol and lightning over the Indo-Gangetic Plain (IGP), India has been evaluated by utilising aerosol optical depth (AOD), cloud droplet effective radius and cloud fraction from Moderate Resolution Imaging Spectroradiometer. Lightning flashes have been observed by the lightning Imaging sensor on the board of Tropical Rain...
Article
Full-text available
Air pollution is a major threat to the health of the inhabitants of most large cities in the world including Delhi, the second most populated city. Delhi with 25 million people is among the most polluted. Meteorology as well as increasing anthropogenic emissions play important roles in Delhi's reduced air quality. Winter is marked by thick fog, low...
Preprint
Full-text available
We studied the impact of the odd-even traffic rule (implemented in Delhi during 1-15 January 2016) on primary traffic emissions using measurements of 13 volatile organic compounds, carbon monoxide, carbon dioxide and methane at a strategic arterial road in Delhi (28.57N, 77.11E, 220 m amsl). Whole air samples (n = 27) were collected during the od...
Article
Full-text available
We studied the impact of the odd-even traffic rule (implemented in Delhi during 1-15 January 2016) on primary traffic emissions using measurements of 13 volatile organic compounds, carbon monoxide, carbon dioxide and methane at a strategic arterial road in Delhi (28.57N, 77.11E, 220 m amsl). Whole air samples (n = 27) were collected during the od...
Article
The first measurements of cloud condensation nuclei (CCN) at five supersaturations were carried out onboard the research vessel “Sagar Kanya” (cruise SK-296) from the south to the head-bay of the Bay of Bengal as part of the Continental Tropical Convergence Zone (CTCZ) Project during the Indian summer monsoon of 2012. In this paper, we assess the d...
Article
The frequency and intensity of fog episodes during the winter season has been increasing during the past decade over the megacity of Delhi due to the high pollution load. The role of atmospheric aerosols is very important in the life cycle of fog in the urban areas. This paper presents the results on the variation in aerosol optical properties (sca...
Article
Full-text available
This paper appraises the association of lightning flash count (FC) with rainfall using the satellite-borne Lightning Imaging Sensor’s (LIS) data along with gridded rainfall data (0.5o × 0.5o) for Indian summer monsoon seasons over 10 years (2001–2010). During strong El Nino years, 2002 and 2009, FCs were greater in magnitude by about 26.5 % and 37...
Article
This paper presents the first onboard measurements of cloud condensation nuclei (CCN) distributions at super-saturations (ss) less than 0.5% (0.2% and 0.4%) and more than 0.5% (0.6% and 0.8%) as a function of prevailing winds during July and August over south to southeastern head-Bay region of Bay of Bengal (BoB). During monsoon season of 2012, the...
Poster
A series of numerical experiments were carried out with various combinations of physical parameterization schemes to determine the fidelity of the Weather Research and Forecasting (WRF) model (at 2 km resolution) to simulate fog event at Barkachha (in IGP,25.06N, 82.59E). These simulations with four Planetary Boundary Layer (PBL) combined with five...
Article
Full-text available
The objectives of the Winter Fog Experiment (WIFEX) over the Indo-Gangetic Plains of India are to develop better now-casting and forecasting of winter fog on various time- and spatial scales. Maximum fog occurrence over northwest India is about 48 days (visibility < 1000 m) per year, and it occurs mostly during the December-February time-period. Th...
Article
Full-text available
Post-facto documentation is made to record the signatures of a major cloud burst and triggered flash floods in the Leh Valley region of the Indus River (Ladakh Himalaya) occurred during 2010. The most notable signatures include linear imbricate alignment of the sub-rounded boulders, paired bank-erosion, sharp axial incision of the stream beds and o...
Article
Full-text available
This paper discussed the urban heat island (UHI) intensity and local air quality by using observational data of project of the System of Air Quality Forecasting and Research (SAFAR) over Delhi during the month of May and December 2013. It is found that UHI magnitudes ~2.2˚C and ~1.5˚C are formed at the evening traffic hours during May and December...
Article
First time-a tethered balloon-based soot measurement in a megacity " Del-hi ". • Sign. higher BC conc.(~1.9 μg/m 3) near the boundary layer (BL) during the foggy period • ~ 20% contribution of BC to near ultra-fine particles (PM 1.0) at surface and BL • Cons. of BC 370 nm and PM 10 increased ~85% & 46% during dense foggy period. • Higher heating (2...
Article
This study examines the contribution of 20% reduction in anthropogenic emissions from the energy, industry and transport sectors in South Asia to global distribution of ozone (O3) during summer and winter monsoon seasons. We used Model for Ozone and Related chemical Tracers (MOZART-4) and Hemispheric Transport of Air Pollution version-2 (HTAP-v2) e...
Article
In this article, we investigate indicators for lightning activity by analysing the data of surface heat flux, Bowen ratio (ratio of sensible to latent heats) and cloud base height for a period of 16 years (1998–2013) over Indo-Gangetic Plain (IGP) (25°–27°N, 80°–88°E), Indian land excluding IGP (8°–36°N, 68°–98°E) and 10 years (2000–2009) over Indi...
Article
This bottom-up modeling study, supported by new population census 2011 data, simulates ozone (O3) and fine particulate matter (PM2.5) exposure on local to regional scales. It quantifies, present-day premature mortalities associated with the exposure to near-surface PM2.5 and O3 concentrations in India using a regional chemistry model. We estimate t...
Article
In this study, we evaluate the potential impact of ground level ozone (O3) on rice and wheat yield in top 10 states in India during 2005. This study is based on simulated hourly O3 concentration from the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem), district-wise seasonal crop production datasets and accumulated daytime...
Article
A network of air quality and weather monitoring stations was established under the System of Air Quality Forecasting and Research (SAFAR) project in Delhi. We report observations of ozone (O3), nitrogen oxides (NOx), carbon monoxide (CO) and particulate matter (PM2.5 and PM10) before, during and after the Diwali in two consecutive years, i.e., Nove...
Article
This study presents the distribution of tropospheric ozone and related species for South Asia using the Model for Ozone and Related chemical Tracers (MOZART-4) and Hemispheric Transport of Air Pollution version-2 (HTAP-v2) emission inventory. The model present-day simulated ozone (O3), carbon monoxide (CO) and nitrogen dioxide (NO2) are evaluated a...
Article
In this work, we compare for the first time different anthropogenic NOX emission inventories and examine the associate variation in simulated surface ozone (O3) in India. Six anthropogenic NOX emission inventories namely Emission Database for Global Atmospheric Research (EDGAR), Intercontinental Chemical Transport Experiment-Phase B (INTEX-B), Regi...
Article
Full-text available
This work presents the association of flash rate density (FRD) with surface air temperature, rainfall and convective available potential energy (CAPE) using satellite-based flash count grid (0.5° × 0.5°) data from 1998 to 2007 over Maharashtra, India. We investigate monthly to seasonal variations in lightning activity with rainfall and CAPE. The fi...
Article
In this study, for the first time, the influence of springtime (MAM) biomass burning in South Asia on regional ozone (O3) distribution has been evaluated using a regional chemical transport model (WRF-Chem) and the Fire Inventory from NCAR (FINNv1). Model results are compared with satellite retrievals of tropospheric column amounts of carbon monoxi...
Article
This bottom-up modeling study, supported by emission inventories and crop production, simulates ozone on local to regional scales. It quantifies, for the first time, potential impact of ozone on district-wise cotton, soybeans, rice and wheat crops in India for the first decade of the 21st century. Wheat is the most impacted crop with losses of 3.5...
Article
High emissions of anthropogenic aerosols over Indo-Gangetic Plain (IGP) inspired continuous measurements of fine particles (PM2.5), carbonaceous aerosols (BC, OC and EC), oxides of nitrogen (NOx) and estimation of light extinction (bext) and absorption (babs) coefficients over Delhi during high pollution season in winter from December 2011 to March...
Article
Full-text available
The climatology of lightning activity over the Indian seas (Arabian Sea (AS) and Bay of Bengal (BoB)) has been studied using monthly satellite-based lightning flash count grid (0.5° × 0.5°) data from 1998 to 2007. These data have been used to investigate the annual and seasonal variations in lightning activity over the Indian seas. It was found tha...
Article
In this study, we deal with observations of aerosol column content (height integration of vertical distribution of aerosol number density) that have been carried out using an Ar+ lidar for three different measurement cycles (each cycle consisting of three experimental days associated with non-rain, rain, and non-rain, respectively) of weekly spaced...
Article
The NOx lifetime is needed to determine NOx source strength and allow for source apportionment studies. Satellite observations of tropospheric column NO2 may be used to estimate the NOx lifetime by analysing tropospheric NO2 decay in the outflow region. In this study, we used Scanning Imaging Absorption Spectrometer for Atmospheric Cartography SCIA...
Article
Full-text available
The radiative effects of black carbon (BC) aerosols over New Delhi, the capital city of India, for the period August 2010–July 2011, have been investigated using Santa Barbara DISTORT Atmospheric Radiative Transfer (SBDART) model in the present paper. The monthly mean BC concentrations in Delhi, an urban location, vary in between 15.935 ± 2.06 𝜇gm−...
Article
Full-text available
This article presents a study of east–west regional contrast in lightning activity over India 8°N–35°N, 68°E–98°E using monthly satellite-based lightning flash grid 0.5° × 0.5° data for a period of 10 years 1998–2007. On the premise of nearly equality to land mass location for the Inter-Tropical Convergence Zone ITCZ, India is divided in two region...